Need For Speed Underground cheats and cheat codes for XBox

Go to the main menu and press the following buttons combinations 
on your Xbox controller to unlock tracks, parts and cars:

Unlock Level 1 Performance Parts
Black, Black, R, R, Left, Right, Left, Right

Unlock Level 2 Performance Parts
R, R, R, R, Black, Black, Left, Right

Unlock Level 2 Visual Parts
Down, Left, Up, Down, R, Black, Black, X

Enable drift physics for all cars
R, Up, Up, Up, Down, Down, Down, L

All sprint tracks available
Up, Black, Black, Black, R, Down, Down, Down

All drift tracks available
Right, Right, Right, Right, Left, Black, R, White

All drag tracks available:
Right, X, Left, R, X, L, White, Black

All circuit tracks available
Down, R, R, R, Black, Black, Black, X
   
Unlock Ford Focus
Left, Right, Up, R, Black, R, Black, Up

Unlock Lost Prophets car in quick race:
Up, Up, Up, Right, Down, Down, Up, Right

Unlock Mitsubishi Lancer in quick race:
Left, Left, Left, R, R, Black, Black, White

Unlock Honda S2000 in quick race:
Up, Up, Down, Down, Up, Left, X, Black

Unlock Hyundai Tiburon in quick race:
Left, Right, Left, Right, Up, Down, Up, Down

Unlock Mystikal car in quick race:
Up, Right, Up, Up, Down, Right, Up, Right

Unlock Nissan Skyline in quick race:
Down, Down, L, White, L, White, L, Down

Unlock Nissan Nismo in quick race:
Up, Down, Up, Left, Down, Down, Up, Right

Unlock Nissan Sentra in quick race:
Right, Right, Right, White(2), Black, Black, Up

Unlock Nissan 240SX in quick race:
Up, Down, Left, Right, X, R, White, R

Unlock Nissan 350Z in quick race:
Right, Right, Down, Up, X, L, R, White

Unlock Petey Pablo car in quick race:
Up, Up, Up, Down, Up, Up, Right

Unlock Rob Zombie car in quick race:
Up, Left, Up, Up, Down, Left, Up, Right

Unlock Subaru Impreza in quick race:
Up, Down, Down, Up, White, Up, White, Down

Unlock Acura Integra
Black, Black, R, Black, White, L, Down, Up

Unlock Acura RSX
R, Black, Down, Left, Up, Right, Left, Right

Unlock Toyota Supra  in quick race:
R, R, Black, R, Black, R, White, L


Kurt's Killa Ride:
Use a Stock Mazda RX-7 and keep trying until you win. 

All visual upgrades:
Finish all missions in underground mode. 

Easy drift points:
Turn off the stability control by going into options and selecting "Car". 
This will make the car drift easier.

Get Samanthas Honda Civic
Reach at least 2,000,000 style points

Unlock 10 New Rides
Reach at least 4 million style points.
Nism Nissan Sentra, Acura Integra Type-R, Petey Pablos car, Samanthas car, Rob 
Zombies car, Mystikals car, Lostprophets Nissan Skyline, Junkman's Honda Civic, 
Melissas Nissan 350Z, Eddies Nissan Skyline and a few more if you continue on 
to 5 million style points.